Bobbin



(No Model.)

G. E. GRIMM'.

BOBBN.

' Patented May 25,

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UNITED STATES PATENT OFFICE..

GERHARD E. GRIMM, OF CAMDEN, NEV JERSEY.

BoBBlN.

SPBCIFICATIONfOrming part of Letters Patent No. 342,437, dated May 25, 1886.

Application filed March 17, 1886. Serial No. 195,605. (No model.)

T @ZZ whom it may concern:

Be it known that I, GERHARD E. GRIMM, a citizen of the United States, residing at Gamden, in the county of Camden and State of New Jersey, have invented certain new and useful Improvements in Bobbins, of which the following is a specification.

My invention has for its object the forma tion of a bobbin entirely of paper card-board that shall be symmetrical in shape, inexpensive to manufacture, and also strong and dura ble, designed for the purpose ot' superseding the cumbersome, weighty, and costly spool or bobbinconstructed'of wood, upon which yarn and kindred materials are wound,and to which the chief objections iliade are cost, weight in transportation, liability to break, and trouble in collecting and returning empty spools to the owner.

The invention consists cfa paper cardboard seamless cylinder, which forms the body of the bobbin or spoohhaving a pair oftenons formed upon each end, each pair engaging within a corresponding pairof segmental mortises cut through the circular card-board plates which form the ends and shoulders of the bobbin, and united therein by cement or glue. Previous to the connection of the end disks a circular plate is inserted and cemented within each end of the cylinder, with their outer faces even with the shoulders of the tenons,whereby cementing-surl'ace is provided for the connection of the end disks, in addition to the mortise-and-tenon joints, and rigidity given to the entire bobbin.

In the accompanying d1awings,\vhich make a part of this specification, Figure l is a side elevation of my improved bobbin. Fig. 2 is a longitudinal section of the same. Fig. 3 is an end View. Fig. 4 is a cross-sectional view taken through one of the disks B. Fig. 5 is an end View ofthe cylindrical tube A. Fig. 6 is a side view of one end ofthe cylinder.

Like letters of reference indicate the same parts in all the figures.

A is a seamless cylindrical tube, made of paper card-board, which constitutes the body of the bobbin. It has segmental curved tenons c a cut or formed upon each end, that enter and engage with corresponding -shaped mortises, b b, cut through the disks B, that form the ends or shoulders of the bobbin. Previous to the connection of these disks upon the cylinder A a circular plate, C, is inserted wit-hin each end ot said cylinder, the outer faces of which are even with the shoulders of the tenons and cemented in place to re-enforce and give rigidity. The disks B are then connected by their mortises b to the tenons a, cement or glue heilig used to unite the parts. c is a central oritice in each end of the bobbin.

By the formation of a bobbin or spool in the manner described, composed entirely of paper card-board, better results are obtained than from a wood spool, with less cost, decreased weight, and breakage reduced to a minimum, as the bobbin of paper will with stand great strain and rough usage without damage.

In some cases the reenforcing-plates may be dispensed within the formation ofsmall bobbins.

GERHARD E. GRIMM.

Witnesses:

THOMAS J. BEWLEY, FRANK SCHMIDT.

Having thus described my invention, what 

